Staff Answer
Sep 27, 2026 - 06:24 PM
First, disconnect AC power. Remove the outside access panel and find the boiler (it's wrapped in insulation). Open up the insulation and you'll see the heater in its tube. Loosen the retaining clip or xxxx , disconnect the heater leads at the power board, and slide it out. Then slide the new one in, reconnect the leads, and close up the insulation. The 630811 is now the 638374 AC heater for cooling units with serials above 11231023, and the 621702 AC heater for those below.
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